Protective mask for use in noxious gases



April 30, 1929.

A. a. DRKGER PROTECTIVE MASK FOR USE IN NOXIOUS GASES Filed April 16,1927 Patented Apr. 30, 1929.

UNITED STATES ALEXANDER BERNHARD DRAGER, OF LUBECK, GERMANY, ELFRIEDEDRKGER, aim:

STAN GE, EXECUTED! OF SAID BERGER,

DECEASED.

PROTECTIVE MASK FOR USE IN NOXIOUS GASES.

Application filed April 16, 1927, Serial No. 184,212, and in GermanyApril 28, 1926.

The present invention relates to improvements in piotecl'ive masks foruse with noxious gases. and is haseifl on the discovery of a maternaldefect inherent to the protective iii-asks hitherto in use. This defector drawback consists in that the wearer of a usual protective mask isnot in a position to make use 01' a telescope or a field-glass Thepresent invention discloses suitable means to remedy the said drawback.

In protective masks of usual crmstruction, as is known, thesight-glasses or windows are an appreciable distance from the eyes ofthe wearer of the mask. Only very few faces allow or admit of an aproachinp or pressing of. the sight-glasses so close to the eyes thatwhen using a field'grlass for example, the cye-pieces of the latter arenear enough to the eyes to render possible a tolerably good vision.

rlccording, to the present invention the ossibility of good visionthereby attainet by transferring the sightia. s of the protective maskfrom out of the -irt'ace of the wall of the mask into the interior ofthe mask-body until close in front of the eyes of the wearer. For thispurpose the sight-glasses are expediently placed each in a.funnel-shaped cavity of the Wall of the mask and that in a common plane.so that when. using a fieldglass forexample. the openings of theeyepicccs which are likewise in a common plane, may fit or bear flatly against the sight-glasses. Each sepa rate window is expediently formed insuch a manner that the sightglass and its case made in one single pieceor separately, has the shape of a hollow truncated cone. or pyramid openat its outer end, the two bases of which are not parallel and may havedifferent configurations or outlines. Preferably the base formine theopening in the Wall of the mask-body may have an oblong or oval outline.and the base which is formed by the sight-glass proper a circularoutline.

In the accompanying sheet of drawings which illustrate a preferredel'nbodiment of the invention, Fig. 1 is a front view or elevation ofthe improved protective mask, Fig. 2 is a horizontal sectional view onthe line A-A of Fig. l and Fig. 3 shows on a. larger scale a horizontalcross-section oi. one of the windows.

Similar letters of reference characters refer to similar partsthroughout the several views.

In order to make available a protective scope, the Windows orsight-glasses proper 5 having, as illnstrated in the drawing, a circularoutline, are located in the interior of the mask instead of in thesurface of the wall of the mask-body as usual. They are thereforelocated in close proximity to the eyes 6 of the wearer (Fig. 2) in sucha manner that the two sight-glasses 5 lie in a common plane and theeye-pieces or oculars 7 of the field-glass fitting flatly the saidsight-glasses, may be introduced into the truncated hollow cones 8 inthe nearest possible position to or vicinity of the sight-glasses Therims of larger diameter of the cones or funnels are tightly attached totherims of openings 10 in the mask 8 preferably by means offasteningrims 9 so as to be sealed therein in a gas tight manner. Inthis construction either the sight-glasses 5 only or alsothe cones 8 maybe made of transparent material such as cellon, celluloid and the like.The parts 5 and 8 may be manufactured in one single piece or composed ofseparate pieces. Finally all three parts 5, 8 and 9 may consist of onesingle piece of cellon. celluloid or any other suitable transparentmaterial. The eye-piece constituted by the members 5, 8 and 9 consists,practically. oi a funnel-shaped frame hollow truncated cone or pyramid 8open only at its outer end, the two bases of this body being however notparallel. In the example shown the two non-parallel bases of thetruncated cone or pyramid possess expediently different outlines. thatis to say. the base forming the opening 10 and being situated in thesurface o E the Wall of the mask has an oval configuration and the baseformed by the sight-glass 5 a circular one. The sight-glass 5 (Fig. 3)is provided at its rim with an annular enlarge ment 11 or similar meanswhich allows of the attachment of an antidimming film 12 on the innerside of the sight-glass 5.

The shelhshaped oculars of the field- ;rlasses are for the most partdetachable. By removing these eye-pieces and replacing them by extremelyshort ones it will be possible to bring the field-glass still nearer tothe eyes of the wearer ot' the niask. The eyepieces may also receive aspecial form. for example such that they are somewhat leveled at theside adjacent to the nose of the wearer in order to comfortably adjustthe eye-pieces and the optical axes oi the field-glass when the latteris inserted into the t'nnnelshaped windows, according to the axialdistance of the eyes of the wearer without being obstructed by orinterjlered with the project ing nasal part 2 of the mask.

I claim:

1. In a protective gas mask having ope-1r ings adapted for registry withthe eyes o t the wearer, the combination of two eye-pieces eachcomprising a tunnel-shaped frame hav ing a rim of smaller diameter and arim of larger diameter, the latter being located in aplane forming anangle with the plane of the rim of smaller diameter, the rim of largerdiameter being attached and sealed to the rim of one of said openings sothat said frame projects into the interior oi? the mask, and a windowtightly enclosed by said rim of smaller diameter, both eye-pieces beingso shaped, dimensioned and correlated that their respective windows arelo ated in the same plane in close proximity to the eyes oil? the wearerwhen the mask is in proper position, and that the ocnlars ot aheld-glass o't conventional size may be introduced into their respective frames.

2. The combination set forth in claim 1, in which in either eye-piecethe rim of larger diameter has a ditl'erent configuration from the rimof smaller diameter.

3. The combination set forth in claim 1 in which in either eycpiece therim of larger diameter is oval while the rim of smaller diameter iscircular.

at. In a protective gas mask having a front body portion designed to titloosely over the face and provided with openings adapted tor registrywith the eyes o t the wearer, an eye piece comprising a tunnel-shapedframe having its rim of larger diameter attached and sealed to the r mot one of said openings, said frame projecting into the interior of thenunh so that its rim of smaller diameter is within. said mask, and awindow tightly enclosed by the latter rim of said frame at snhsiantiallythe edge of snch rim, said Itl'tlliit} being so shaped and dimensionedthat said. window is in chase proximity to the eyes ot the wearer whenthe mask is i proper position and that the ocnlars of a held-glass otconrentioinil size may be ii trodnccd into said rra'nie.

5. In a protectire gas mask having a front body portion designed to [itlotsel'r over the face and provided with openings adapted for registrywith the eyes oi the wearer, the combination of two 0 d'iltlftJt-S eacheoiiiprising a tni'metshaped frame having its rim oil. larger diameterattached and scalrd to the rim 01E one of said openings, said frameprojccting into the interior of the mast; that its rim o'l innallerdiameter is within said mask, and a window tightly enclosed by thelatter rim of said frame at substantialtr the edge of such rim, botheye-pieces being so shaped, dimem-zioned and correlated, that theirrespective Wllitlt are located in the same plane in close proximity tothe eyes ot the wearer when the mask is in proper pod-- tion, and thatthe ocnhirs ot a lielitglasii oi? conventional size may be introttncedinto their respectire frames.

In testimony whereof I hare signed my name to this specification.

ALEXANDER BERtlHnRD DRiiGtiit.

